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A bioadhesive lignin-polydopamine/chemical sunscreen microcapsule and its preparation method and application

A technology of chemical sunscreen and polydopamine, which is applied in the field of fine chemicals, can solve the problems of difficult formation of adhesion of polydopamine thin layer, weak physical combination of lignin and polydopamine, etc., so as to improve the anti-photolysis performance , Excellent anti-ultraviolet and anti-oxidation performance, preventing excessive effect

Active Publication Date: 2021-02-12
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the physical combination of lignin and polydopamine is not strong, and it is difficult to form a significant adhesion force on the thin layer of polydopamine.

Method used

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  • A bioadhesive lignin-polydopamine/chemical sunscreen microcapsule and its preparation method and application
  • A bioadhesive lignin-polydopamine/chemical sunscreen microcapsule and its preparation method and application
  • A bioadhesive lignin-polydopamine/chemical sunscreen microcapsule and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Dissolve 1 g of alkali lignin and 1 g of dopamine hydrochloride in 100 mL of Tris-HCl (0.1 mol / L, pH=8.5) solution, add 0.05 g of ammonium persulfate and 0.05 mL of hydrogen peroxide, and stir at room temperature for 12 hours, The supernatant was dialyzed and purified in pure water, concentrated and dried to obtain lignin-polydopamine solid particles.

[0050] (2) 1g of alkali lignin-polydopamine was dissolved in 19mL of pH=8.0 alkali solution to prepare a 5wt% solution, and 20g of ethylhexyl methoxycinnamate and avobenzone (mass ratio of 4 : 1) mixture, 6g Tween, ultrasonic cavitation for 10min under the state of ultrasonic power of 600W, and centrifugation for 30min at 10000r / min to obtain lignin-polydopamine / chemical sunscreen microcapsule paste.

[0051] figure 1 It is the NMR spectrum of alkali lignin raw material and lignin-polydopamine. The signal in the range of 6.3-7.3ppm is the aromatic proton peak in the lignin molecule, the methoxyl proton peak is arou...

Embodiment 2

[0057] (1) Dissolve 5 g of enzymatic lignin and 2.5 g of dopamine hydrochloride in 100 mL of Tris-HCl (0.1 mol / L, pH=8.0) solution, add 0.25 g of ammonium persulfate and 1 mL of hydrogen peroxide, and stir at room temperature for 24 hours, The supernatant was dialyzed and purified in pure water, concentrated and dried to obtain lignin-polydopamine solid particles.

[0058] (2) 2g of alkali lignin-polydopamine is dissolved in 18mL of pH=9.5 alkali solution to prepare a 10wt% solution, add 5g of ethylhexyl methoxycinnamate and avobenzone (mass ratio of 4 : 1) the mixture, 2g alkyl polyglycosides, ultrasonic cavitation 3min under ultrasonic power is 1000W state, 10000r / min centrifugation 30min, obtain lignin-polydopamine / chemical sunscreen agent microcapsule paste.

[0059] Using the same proton nuclear magnetic resonance spectrum analysis, dissolution, scanning electron microscope analysis, and intermolecular force adhesion test as in Example 1, the results are respectively the ...

Embodiment 3

[0061] (1) Dissolve 3 g of solvent-based lignin and 1 g of dopamine hydrochloride in 100 mL of Tris-HCl (0.05 mol / L, pH=9.0) solution, add 0.1 g of ammonium persulfate and 0.5 mL of hydrogen peroxide, and stir at room temperature for 18 hours , the supernatant was dialyzed and purified in pure water, concentrated and dried to obtain lignin-polydopamine solid particles.

[0062] (2) 1.5g of alkali lignin-polydopamine was dissolved in 18.5mL of pH=8.5 alkali solution to prepare a 7.5wt% solution, and 10g of homosalate and avobenzone (mass ratio of 4:1 ) mixture, 2g of sucrose ester, ultrasonic cavitation for 8min under ultrasonic power of 800W, and centrifugation for 30min at 10000r / min to obtain lignin-polydopamine / chemical sunscreen microcapsule paste.

[0063] Using the same proton nuclear magnetic resonance spectrum analysis, dissolution, scanning electron microscope analysis, and intermolecular force adhesion test as in Example 1, the results are respectively the same as th...

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Abstract

The invention discloses a bioadhesive lignin-polydopamine / chemical sunscreen microcapsule, a preparation method and application thereof. The method is: (1) dissolving 1-10 parts by weight of lignin and 0.2-2 parts by weight of dopamine hydrochloride in Tris-HCl buffer solution, adding 0.01-0.5 parts by weight of ammonium persulfate and 0.02-2 parts by weight of 1 part of hydrogen peroxide, stirred at room temperature for 8 to 36 hours, centrifuged to get the upper liquid and dialyzed to obtain lignin-polydopamine; (2) dissolving 1 to 10 parts by weight of lignin-polydopamine in alkaline solution, adding Agent and surfactant, ultrasonic cavitation, to obtain lignin-polydopamine / chemical sunscreen agent microcapsule emulsion. The lignin / chemical sunscreen microcapsule of the invention has excellent ultraviolet absorption performance, good bioadhesion, water resistance and penetration resistance, and solves the problems of poor water resistance of traditional sunscreens, easy penetration into the skin and harming the human body.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and specifically relates to a bioadhesive lignin-polydopamine / chemical sunscreen microcapsule and its preparation method and application. Background technique [0002] Long-term exposure to ultraviolet light (UV) can cause damage to human skin. Among them, long-term or excessive exposure to ultraviolet light in the 290-320nm wavelength range (UVB region) will cause the skin to tan, and cause redness, swelling and peeling. Ultraviolet rays in the 320-400nm wavelength range (UVA region) have strong penetrating power, can penetrate most transparent glass and plastics and can directly reach the dermis of the skin, destroying elastic fibers and collagen fibers. Long-term exposure to ultraviolet light, whether it is in the UVA or UVB region, can significantly increase the production of reactive oxides (ROS) in the human body, and the presence of ROS can damage cellular components such as DNA. [0003] S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61K8/84A61K8/11A61K8/35A61K8/37A61K8/72A61Q17/04
CPCA61K8/11A61K8/35A61K8/37A61K8/72A61K8/84A61K2800/56A61K2800/82A61Q17/04
Inventor 钱勇邱学青周义杰杨东杰楼宏铭易聪华
Owner SOUTH CHINA UNIV OF TECH
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